4.12
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Control Logic
Output Contacts
Operation of Output
Contacts for Different
Output Contact Types
Output Contacts OUT101 through OUT107 and OUT201 through OUT212
The execution of the serial port command PULSE xxx (xxx = OUT101–OUT107,
OUT201–OUT212), asserts the corresponding Relay Word bit (e.g., OUT104) to
logical 1, for one or more seconds as defined by the user. The assertion of
SEL
OGIC control equation setting OUTm (m = 101–107, 201–212) to logical 1
also asserts the corresponding Relay Word bit OUTm to logical 1.
The assertion of Relay Word bit OUTm to logical 1 causes the energization of
the corresponding output contact OUTm coil. Depending on the contact type
(a or b), the output contact closes or opens. An a type output contact is open
when the output contact coil is de-energized and closed when the output
contact coil is energized. A b type output contact is closed when the output
contact coil is de-energized and open when the output contact coil is
energized. Solder jumpers JMP22 through JMP29 (main board) and JMP17
through JMP28 (interface board) permit the user to configure any OUTm
contact to either an a or b type. OUT101 through OUT107 are factory-configured
as type a, as are OUT201 through OUT212 if the additional interface board is
ordered.
The state of OUTm remains the same while a setting change is in progress.
However, once the new settings are enabled, the SEL
OGIC control equation
setting for OUTm will determine the new state of OUTm.
OUT107 coil operation may be set to follow that of the ALARM contact by setting
jumper JMP23 in the left position on the main board. OUT107 then will not
respond to Relay Word bit OUT107. The OUT107 contact configuration can be
set as a or b, as noted above. See Section 2: Installation for more information.
ALARM Output Contact
When the relay is functioning properly, the alarm logic/circuitry keeps the
ALARM output contact coil energized. The type b ALARM output contact is
normally held open. Solder jumper JMP21 may also be configured by the user
for a type a contact, if desired.
To verify ALARM output contact functionality, execute the serial port command
PULSE NOTALM. Execution of this command momentarily de-energizes
the ALARM output contact coil.
The Relay Word bit NOTALM is asserted to logical 1, and the ALARM output
contact coil is energized, when the SEL-387 is operating correctly. When the
serial port command PULSE NOTALM (or front panel {CNTRL ALARM}) is
executed, the NOTALM Relay Word bit momentarily deasserts to logical 0.
Also, when the relay enters Access Level 2 or Access Level B or a settings
change is made, the NOTALM Relay Word bit momentarily deasserts to
logical 0. When NOTALM is zero, the ALARM output contact coil is de-
energized momentarily and the b contact falls closed. The ALARM contact also
drops closed when a loss of power occurs.
NOTE: In the SEL-387-5 and
SEL-387-6 Relays with firmware
revisions prior to R600, the NOTALM
Relay Word bit is !ALARM.
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